package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.toolkit.BeanUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;

import static com.baomidou.mybatisplus.core.toolkit.Wrappers.query;
import static com.hmdp.utils.RedisConstants.LOGIN_CODE_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        /**
         * 发送短信验证码并保存验证码
         */
        //1.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            //正则表达式匹配合法的手机号
            //2.如果不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3.符合 生成验证码
        //生成六位随机验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到session
        session.setAttribute("code",code);
        //5.发送验证码
        log.debug("发送验证码成功, 验证码为: " + code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //        实现登录功能
        //1.校验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)){
            //正则表达式匹配合法的手机号
            //2.如果不符合返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3. 从redis中获取验证码并校验
        //Object cacheCode = session.getAttribute("code");
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.toString().equals(code)){
            //获取验证码 如果不一致 报错
            return Result.fail("验证码错误");
        }
        //一致 根据手机号查询用户
        User user = query().eq("phone", phone).one();
        //4.判断用户是否存在'
        if(user == null){
            user = createUserWithPhone(phone);
        }
        //不存在则创建
        session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class)) ;
        //5.存在 将用户保存到redis中
        //随机生成token 作为登陆令牌
        String token = UUID.randomUUID().toString(true);
        //将User对象转为HashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String,Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));

        //存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //设置token有效期
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);
        //返回token
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        return null;
    }
}
